historyApiFallback doesn't work in Webpack dev server
I meet the same question today.let config in webpack.config.js: output.publicPath be equal to devServer.historyApiFallback.index and point out html file route。my webpack-dev-server version is 1.10.1 and work well. http://webpack.github.io/docs/webpack-dev-server.html#the-historyapifallback-option doesn't work, you must point out html file route.
for example
module.exports = { entry: "./src/app/index.js", output: { path: path.resolve(__dirname, 'build'), publicPath: 'build', filename: 'bundle-main.js' }, devServer: { historyApiFallback:{ index:'build/index.html' }, },};historyApiFallback.index indicate that when url path not match a true file,webpack-dev-server use the file config in historyApiFallback.index to show in browser rather than 404 page. then all things about your route change let your js using react-router do it.
output: { ... publicPath: "/" },Adding public path solved this for me
I had this problem and was only able to fix it using index: '/' with webpack 4.20.2
historyApiFallback: { index: '/' }